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Block titanium-molybdenum-niobium alloy and preparation method thereof

A technology of niobium alloy and titanium molybdenum is applied in the field of bulk titanium molybdenum niobium alloy and its preparation, which can solve the problems of reduced grain boundary strength, easy occurrence of brittle fracture, abandoning solid solution strengthening, etc., and achieves the effect of improving plasticity

Inactive Publication Date: 2020-11-27
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

By forming a stable and dispersed carbide phase, the strength and high temperature resistance of molybdenum-based alloys are improved, but due to the extremely low solubility of interstitial atoms carbon, nitrogen, and oxygen in molybdenum, the redundant interstitial atoms are distributed in the form of compounds. At the grain boundary, the strength of the grain boundary is reduced, making processing difficult and prone to brittle fracture, which is the main reason why the application of molybdenum alloys is limited.
In addition, studies in recent years have shown that in the immiscible alloy system, the stability of the nanocrystalline structure can be improved and its high temperature Strength and wear resistance, but this method completely abandons solid solution strengthening, and because the components are completely insoluble, there are higher requirements for the preparation method

Method used

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  • Block titanium-molybdenum-niobium alloy and preparation method thereof
  • Block titanium-molybdenum-niobium alloy and preparation method thereof
  • Block titanium-molybdenum-niobium alloy and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0064] (1) In a glove box full of argon protection, by mass percentage, 30% titanium powder, 30% molybdenum powder and 40% niobium powder are mixed, and the amount of titanium powder, molybdenum powder and niobium powder The purity is 99.5%, 99.5% and 99.8%; the alloy powder is placed in a high-energy ball mill, the mass ratio of the ball and the alloy powder is controlled to be 6:1, the rotation frequency of the high-energy ball mill fixture is 17Hz, and the rotation speed is 1700r / min; High energy ball milling for 15 hours to obtain titanium molybdenum niobium solid solution alloy powder;

[0065] (2) Place the alloy powder obtained in step (1) in a graphite mold, put it into a discharge discharge plasma sintering furnace, and heat it up to 850°C at a rate of 100°C / min for 5min under a vacuum of 0.01Pa. During the sintering process, a constant pressure of 60 MPa is applied axially to the alloy powder, and after the sintering is completed, the temperature is lowered under vac...

Embodiment 2

[0069] (1) In a glove box full of argon protection, by mass percentage, 25% titanium powder, 35% molybdenum powder and 40% niobium powder are mixed, and the amount of titanium powder, molybdenum powder and niobium powder The purities are 99.5%, 99.5% and 99.8% respectively; the alloy powder is placed in a high-energy ball mill, the mass ratio of the ball to the alloy powder is controlled to be 8:1, the rotation frequency of the fixture of the high-energy ball mill is 17Hz, and the rotation speed is 1750r / min; High energy ball milling for 12 hours to obtain titanium molybdenum niobium solid solution alloy powder;

[0070] (2) Place the alloy powder obtained in step (1) in a graphite mold, put it into a discharge discharge plasma sintering furnace, and heat it up to 900°C at a rate of 100°C / min for 5min under a vacuum of 0.01Pa. During the sintering process, a constant pressure of 45 MPa is applied axially to the alloy powder. After the sintering is completed, the temperature is...

Embodiment 3

[0074](1) In a glove box full of argon protection, by mass percentage, 35% titanium powder, 30% molybdenum powder and 35% niobium powder are mixed, and the amount of titanium powder, molybdenum powder and niobium powder The purities are 99.5%, 99.5% and 99.8% respectively; the alloy powder is placed in a high-energy ball mill, the mass ratio of the ball and the alloy powder is controlled to be 5:1, the rotation frequency of the fixture of the high-energy ball mill is 17Hz, and the rotation speed is 1750r / min; High energy ball milling for 18 hours to obtain titanium molybdenum niobium solid solution alloy powder;

[0075] (2) Place the alloy powder obtained in step (1) in a graphite mold, put it into a discharge discharge plasma sintering furnace, and heat it up to 950°C at a rate of 100°C / min for 8 minutes under a vacuum of 0.01Pa. During the sintering process, a constant pressure of 60 MPa is applied axially to the alloy powder, and after the sintering is completed, the tempe...

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Abstract

The invention relates to a block titanium-molybdenum-niobium alloy and a preparation method thereof. The method comprises the following steps: (1) mixing titanium powder, molybdenum powder and niobiumpowder, and grinding to obtain alloy powder; (2) sintering the alloy powder obtained in the step (1) to obtain the block titanium-molybdenum-niobium alloy; and (3) carrying out heat treatment on theblock titanium-molybdenum-niobium alloy obtained in the step (2) to obtain the block titanium-molybdenum-niobium alloy. According to the preparation method provided by the invention, the preparation process is reasonably arranged, the prepared block titanium-molybdenum-niobium alloy has the advantages of corrosion resistance, high hardness and good high-temperature resistance by utilizing the coupling effect between the steps, and the prepared block titanium-molybdenum-niobium alloy has good plasticity while maintaining high strength by adjusting and controlling the microstructure of the alloy.

Description

technical field [0001] The invention relates to the field of alloys, in particular to a bulk titanium-molybdenum-niobium alloy and a preparation method thereof. Background technique [0002] For metal components serving in harsh environments such as high load, high-speed rotation, frequent reciprocation, high temperature and corrosive environments, wear, corrosion, high temperature oxidation and softening are important factors affecting the service life of metal components. Among them, the wear resistance of materials depends on two factors: the hardness of the material and the microstructural evolution of the material subsurface during the friction process. Generally speaking, the higher the hardness of the material, the stronger the ability of the subsurface to resist or absorb plastic deformation, the better the wear resistance of the material; while in high temperature service, high temperature oxidation and thermal softening are the main factors affecting the performanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C27/02C22C1/04B22F3/105B22F9/04
CPCB22F3/105B22F9/04B22F2003/1051B22F2009/043B22F2998/10C22C1/045C22C14/00C22C27/02C22C27/04C22C30/00B22F2003/248
Inventor 任富增朱微微赵璨璨万天
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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